IS 13071 : 1981 ( Reaffirmed 2012 ) k;sr3 * @T,FTTTw&T3 - kf%rfE Indian Standard RUBBERHOSE,WIREREINFORCEDFOR SANDANDGRAVELSUCTIONAND DISCHARGESERVICES -SPECIFICATION UDC 621'643'3'052'2 [ 678'4 ] @ BIS 1991 BUREAU MANAK ApriZ 1991 OF BHAVAN, INDIAN STANDARDS ZAFAR MARG Price Group 2 9 BAHADUR SHAH NEW DELHI 110002 Rubber Products Sectional Committee, PCD 13 . FOREWORD This Jndisn Stacdards WCSadopted by the Bureau of Indian Standards, after the draft finaIized by the Rubber Prcducts Sectional Committee hsd been approved by the Petroleum, Coal and Related Products Division Council. The Ccmmittee considered it desireble to include abrasion resistance test. However, no requirement has been included due to inadequate data. Investigations in this regard are in progress and requirement for this test may be included in the standard at a later date. The hoses covered under this standard are used for sand and gravel suction,and discharge services, suitable for a working pressure up to 1'0 MPa and vacuum of 83 kPa ( 500 mm of mercury ). This standard car tains clauses 4.1.5 and 4.3 which call for agreement between the supplier. the purchaser and For the puryose of decidirg whether a particular requirement of this standard is complied with, the fire1 value observed or calculated, expressing the result of a test or analysis, shall be rounded off in accorcence with 1s 2 : 1960 `Rules for roundirg off numerical values ( revised )`. The number of signi&ant plzces retained in the rounded cff value should be the same as that of the specified in this standard. hiian Standard RUBBER HOSE, WIRE REINFORCED FOR SAND AND GRAVEL SUCTION AND DISCHARGE SERVICES - SPECIFICATION 1 SCOPE 1.1 This Indian Standard prescribes the requirements and the methods of sampling and test for sand and gravel suction and discharge hose, suitable for a maximum working pressure of 0'7 MPa and 1'0 MPa and vacuum of 83 kPa ( 500 mm of mercury ), having smooth and abrasion resistant inner and outer cover. 2 REFERENCES 2.1 The following Indian Standards sary adjuncts to this standard: IS No. 4.1.2 Reinforcement The reinforcement shall consist of a well rubberized, suitably woven textile fabric and shall incorporate one or two galvanized wire hdices embedded in layers of rubber compounds. 4.1.3 Cover The cover shall consist of a suitable rubber compound resistant to abrasion and ageing. The cover agreed to supplier. shall be smooth or corrugated as between the purchaser and the . are neces- Title 280 : 1978 Mild steel wire for general engineering purposes ( third revision ) Methods of sampling and 443 : 1975 test for rubber hoses (second revision ) Methods of `test for vulca3400 ( Part 4 ) : 1987 nized rubbers: Part 4 Acce( second ageing lerated revision ) Glossary of terms used in 7503 industry: Part 1 ( Part 1 ) : 1988 rubber Definitions of basic terms ( first revision ) Glossary of terms used in 7503 Part 3 industry: ( Part 3 ) : 1988 rubber Definitions relating to properties and testing ( first revision ) Glossary of terms used in 7503 Part 5 industry: ( Part 5 ) : 1988 rubber relating to Definitions products - Hoses ( first revision ) 3 TERMINOLOGY 3.1 For the purpose of this standard, the definitions given in IS 7503 ( Part 1 ) : 1988, IS 7503 ( Part 3 ) : 1988 and IS 7503 ( Part 5 ) : 1988 shall apply. 4 REQUIREMENTS 4.1.4 Embedded wire helix shall be closely spiralled over the nipples in the case of buiIt in fittings. 4.1.5 The lining and thickness, reasonably air blisters, porosity have a cloth marked cover shall be uniform in concentric and free from and splits. The cover may finish. 4.1.6 The mild steel wire used shall be galvanized ( see IS 280 : 1972 ). 4.2 Dhneasioas and Tolerances 4.2.1 Bore Size The bore size and the tolerance on it, when measured according to the method prescribed in 4.2.1.2 of IS 443 : 1975 shall be as given in Table 1. Table 1 Sl No. (1) 0 ii) Nominal Bore Size with Tolerances Tolerance on Bore !%ize Rlni (3) f3 f3 f3 Zt3 f3 iii) iv) v) Nominal.Bore Size mm (2) 100 150 200 250 300 4.2.2 Thickness of the Lining and the Cover The thickness of the lining and the cover of the hose when measured according to the method prescribed in 4.2.2 of IS 443 : 1975 shall not be less than 6'3 mm and 2'5 mm respectively. 4.2.3 Length Hose length shall be measured from end to end and when supplied with fittings, from face to 1 4.1 Constrllctlell 4.1.1 Lining A rubber inner lining sand and gravel. resistant to abrasion of IS 13071:.l!m face of fittings. For hoses having 100 mm bore, the maximum length shall be 15 metres. For hoses having bore above 100 mm but up to 200 mm, the maximum length shall be 9 metres and for hoses abqve 200 mm bore, the maximum length shall be 7'5 metres. 4.2.3.1 The tolerance on the hose length shall be `5 1 percent. 4.3 Hose Ends It is normal in this type of hose to have wire free end either of the same nominal bore as the hose or enlarged to take a full bore fitting. If the enlarged ends are required, length and diameter of the ends shall be specified by the purchaser and the tolerance for the internal diameter of the hose shall apply to the enlarged ends also. NOTE - In case of built in nipples, the flanges shall be attached to the nipples by welding or any other form as agreed to between the purchaser and the manufacturer so as to provide good anchorage for the hose ends. The design of the nipples and the method of building them in the hose shall be the responsibility of the hose manufacturer. d) The number of welds shall not exceed one in a hose up to 6 m in length and shall not exceed two in a hose above 6 m in length. 4.5 Requirements of Physical, Tests on Finished Hose 4.5.1 The' requirements of physical tests finished hose shall be as given in Table q.,.. 4.6 Performance Hose 4.6.1 Adhesion The adhesion strength when tested according .to the method prescribed in IS 3400 ( Part 5 ) : 1986 shall be not less than 2 kPa ( or 4'5 kgf ) for the following: a) Between reinforcement plies; .. b) Between lining and reinforcement~ply; and c) Between cover and reinforcement ply. NOTE - This test is applicable without fittings. for hose supplied on Requirements for the Finished 4.6.2 Hydraulic Pressure Test The 4.4 Joint Wires Constructional helical reinforcement be joined by welding provided that: helix; wires may a) There shall be no such joint in the internal b) The welding of wires shall be carried out by using electrical butt welding method; hose shall not show any sign of failure or defect when tested as follows: a) Lay out the hose as straight as possible; b) Fill with water, vent to remove all air, and apply a pressure of 0'07 MPa; 4 Measure the overall length of the hose assembly; d) Increase 4 No welding joint shall be within 1.5 m of the end of nipples end, in the case of built in nipple or of another weld in the same wire; and Table 2 the pressure over a period of 5 minutes from 0'07 MPa to half the maximum working pressure marked on the hose. Hold this pressure for 10 minutes; Physical Requirements ( Clause 4.5.1 ) Test Specimen (5) cut from the hose 1 cut from the hose J cut from the hose Methods (6) of Tests Sl No. Characteristic Requirement r----__T 12) (1) 0 Teqsile strength, MPa, Min ii) Elongation at break, percent iii) Accelerated ageing Test: \-I Lining (3) Min i0.b 4CKPO Zer IGo Test specimen Test specimen Test specimen Test specimen 400.0 > . ' 5 of IS 443 : 1975 a) Change in tensile strength, percent of the original value, Max b) Change in elongation at break, percent of the original value, Max 125 +10 -30 ~t25 t-10 -30 7 b cut from the hose' 1 NOTES 1 These tests are applicable only for hoses supplied without fittings. 2 If the fabric is attached or combined in the rubber sample, removethe same before cutting the test piece. Avoid preferably, the use of a swelling agent while removing the fabrrc, but benzene, chloroform or carbon Take care to avoid stretching of the tetrachloride may be used to wet the contacting surfaces, if necessary. rubber during the separation from the fabric, and if swelling liqmd is used, allow the same-to evaporate Make the cloth marked surface smooth by buffing. completely from the rubber surface after separation. Buff the rubber sample as and when necessary of an even thickness, or of the thickness above_ that specified for the wet piece which is to be cut from it. During buffing, avoid undue heating of the rubber. IThe sample, shall be tested at 70° je 1°C for 72 h. 2 IS 13071 : 1991 e) Raise f) the pressure over a period of 5 minutes up to one and half times the working pressure and hold for 10 minutes; and Before releasing the full test pressure, measure overall length of the hose assembly to ascertain the temporary elonaation and record the increase as perc&tage of original length measured at 0'07 MPa. Table 3 Bend Radius ( Clause 4.6.6 ) Sl No. Nominal `Bore (mm) (2) 100 150 200 250 300 Maximum Fo$;; Working Pressure: 0.7 MPa Pressure: 1-O MPa ::I) 1 *oo 1.40 1.85 2.30 2.75 Cm) (4) 1.00 1.60 2'15 2.70 3'30 (1)' i) ii) iii) 4.6.3 Elangation When tested in accordance with 4.6.2, the temporary elongation shall not exceed 10 percent and permanent elongation shall not exceed 2'5 percent of the original length. 4.6.4 Burst Pressure Test The production sample of hose when tested according to the method prescribed in 8.2 of IS 443 : 1975, shall not burst below three times the designed working pressure of the hose. 4.6.5 Vacuum Test Each hose shall be capable of withstanding a vacuum of 83 kPa ( 500 mm of mercury > for a period of 10 minutes without collapse or failure of any part of the hose. The interior lining shall then be examined, by reflected light from a mirror, for any visible sagging of the lining or other imperfections. 4.6.6 Bending Test The hose shall be bent to the appropriate radius specified in Table 3. While in bent position, the test specified in 4.6.2(b), (d), and (e) shall be repeated. 5 SAMPLING AND CRITERIA FOR CONFORMITY 5.1 For the purpose of ascertaining the conformity of the hose in a consignment to the specification , the scale of sampling and the criteria for conformity shall be as prescribed in 3 of IS 443 : 1975. 6 PACKING AND MARKING iv) v) the purchaser and the supplier. However, the following precautions shall be observed during packing: The hose shall be suitably wrapped in hessian over their entire length. They may be crated if desired. Flanged end shall be protected by circular discs slightly greater than the diameter of the flange, bolted in two diametrically opposite places. 6.2 Marking Each length of hose shall be indelibly adjacent to the end with: a) Indication marked, of the source of manufacture; b) The hose denomination, type or bore and maximum working pressure; c) Factory test pressure; and d) Month and year of manufacture. 6.2.1 Each length of hose may also be marked with the Standard Mark. 7 TIME LAPSE BETWEEN RECEIPT MATERIAL AND TESTING OF 7.1 For all test purposes, the minimum time between vulcanization and testing shall be 16 h. 7.1.1 For product tests, whenever possible the time between the vulcanization and testing should not exceed 4 months. In other cases, tests shall be made within 2 months from the date of reciept of the product by the customer. 6.1 Packing The hoses shall be packed as agreed to between 3 . Standard Mark by the provisions of the Bureau of Indian made thereunder. The Standard Mark on products covered by an Indian Standard conveys the assurance that they have been produced to comply with the requirements of that standard under a well defined system of inspection, testing and quality control which is devised and supervised by BIS and operated by the prochecked by BIS for conformity to ducer. Standard marked products are also continuously Details of conditions under which a licence for the use that standard as a further safeguard. of the Standard Mark may be granted to manufacturers or producers may be obtained from the Bureau of Indian Standards. The use of the Standard Mark is governed Standards Act, 1986 and the Rules and Regulations Borean of Indian Standards BIS is a statutory institution established under the Bureau of Indian Standards Act, I986 to promote harmonious development of the activities of standardixation, marking and quality certification of goods and attending to connected matters in the country. Copyright . BIS has the copyright of all its publications. No part of these publications may be reproduced in any form without the prior permission in writing of BIS. This does not preclude the free use, in the course_of implementing the standard, of necessary details, such as symbols and sizes, type or grade designations. Enquiries relating to copyright be addressed to the Director ( Publication ), BIS. Revision of Indian Standards Indian Standards are reviewed periodically and revised, when necessary and amendments, if any, are issued from time to time. Users of Indian Standards should ascertain that they are in possession of the latest amendments or edition. Comments on this Indian Standard may be sent to BIS giving the following reference : Dot : No. PCD 13 ( 599 ) Amendments Issued Since Publication Amend No. Date of Issue Text Affected BUREAU OF INDIAN STANDARDS Headquarters : Manak Bhavan, 9 Bahadur Shah Zafar Marg, New Delhi 110002 Telephones : 331 01 31, 331 13 75 Regional Offices : Central : Mmak Bhavan, 9 Bahadur Shah Zafar Marg NEW DELHI lloQo2 Eastern : I/14 C.I.T. Scheme VII M, V.I.P. Road, Maniktola CALCUTTA 700054 Northern : SC0 445446, Sector 3!I-C, CHANDIGARH 160036 Southern : C.I.T. Campus, IV Cross Road, MADRAS 600113 Western : Manakalaya, E9 MIDC, Marol, Andheri ( East ) BOMBAY 400093 Branches : AHMADABAD. BANGALORE. BHOPAL. BHUBANESHWAR. COIMBATORE. FARIDABAD. GHAZIABAD. GUWAHATI. HYDERABAD. JAIPUR. KANPUR. PATNA. THIRUVANANTHAPURAM. Telegrams : Manaksanstha ( Common to all OlBcea ) Telephone 331 01 31 331 13 75 37 86 62 53 38 43 41 29 16 6 32 92 95 Printed at Swatantra Bharat Press, Delhi. India